Shock-absorber attachment.



TINTTFU STATES PATENT OFFTE.

HERMAN MORITZ, JOSEPH J. KOELSCH, AND FRANK T. KOEHN, OF DURHAM, KANSAS.

SHOCK-ABSORBER ATTACHMENT.

Specification of Letters Patent.

Patented Apr. it, 19ML Application filed May 3, 1912. Serial No. 694,919.

To all whom it may concern Be it known that we, HERMAN MORITZ,

JOSEPH J. Konnscn, and FRANK T. Konrnv,V

vple device that may be attached to most of the motorcycle trames now in general use without alterations to the trames.

VVit-h the above object in view the invention consists of certain novel details ot' construction and combination oit parts hereinaiter fully described and claimed, it being understood that various modiiications may be made in the minor details of constructionl within the scope out the appended claim.

Tn the accompanying drawing forming part of this speciiicationz-Figure 1 is a side elevation of the device applied. Fig. 2 is a plan view of the device applied. Fig. l) is a vertical sectional view taken on the line 3 3 Fig, 1. Fig. 11 is a horizontal sectional view taken on the line 4 4 Fig. 1.

Referring new to the drawing in which like characters of reference designate similar parts, 10 designates the rear or driving wheel, and 11 the rear wheel supporting forks of the motorcycle, it being understood that the above construction is common in bicycles as well as motoii'cycles and that the shock absorber comprising the subject-matter ot' this invention is applicable to both bicycles and motorcycles.

The shock absorber comprises two similar plates 12, a bolt 13 being passed through bearings 14 formed in the plates and through the axle receiving slot-s 15 of the bicycle frame, to secure the plates to the trame, both plates extending rearwardly :trom the frame as shown. Both plates are provided with slots 16 at the rear ends to receive the wheel axle 17.

Spiral springs 18 are arranged on the outer sides of the trame, the inner convolution ot' each spring being directed about. the bolt 13 and being clamped to the 'trame through the instrumentality ot a washer 19 and nut 20 carried on the related end of the bolt. The said inner convolution terminates in a laterally directed end 21 which fits in the axle receiving slots 15 of the frame. The end of the outermost convolution of each spring is directed laterally on the same side of the spring as the end of the innermost convolution as shown at 22, and this end 22 is selectively engageable in a series of openings 23 iormed in the related plate 12. The plates 12 may thus rock vertically at the rear ends when the wheel passes over obstructions, the springs storing up energy during this rocking movement ot' the plates to return the plates to initial position after the wheel passes beyond the obstruction. By engaging the terminals ot the outer convolutions ot the springs in any particular openings of the series the tension of the spring may be varied whereby to limit yielding movement upwardly of the plates.

What is claimed, is

A shock absorber comprising in combination with a wheel supporting fork having alined slots therein, spaced plates, bearings in the forward ends of said plates, a pivot pin passed through said bearings and terminally secured in said slots, spaced spiral springs having their innermost convolutions directed about the terminals of said pin and thence bent laterally and engaged in said slots, the outermost convolutions of saidsprings being terminally bent laterally and being adapted to be engaged in openings tormed in said plates, and means at the rear ends of said plates tor .securing a ground wheel.

In testimony whereof, we aiiix our signatures in presence of two witnesses.

HERMAN MORTZ. JOSEPH J. KOELSCH. FRANK T. KOEHN.

`Witnesses GUs'rAv OswALD, EMIL T. KOEHN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Y Washington, D. C. 

